Serving tray



FIG. 1 is a front and top perspective view of a serving tray showing mynew design;

FIG. 2 is a bottom perspective view;

FIG. 3 is a left side elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view;

FIG. 6 is a rear elevational view.

The ornamental design for a serving tray, as shown.